The blur effect to apply to the bar's background.
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@property(nonatomic, readwrite, copy) UIBlurEffect *backgroundEffect;
The blur effect provides the base layer for the bar's appearance, and it determines how much of the underlying content is visible. UIKit applies the backgroundColor and backgroundImage on top of this effect.
The background color of the bar.
The image to display on top of the bar's background color.
The content mode to use when displaying the bar's background image.